Pump



Patented June 27, 1939 N UNITED STATES PATENT OFFICE 2 Claims.

This invention relates to pumps; and more particularly, to hand pumps for use in connection with aircraft and adaptable to a variety of purposes such as inilating or deflating pneumatic devices, forcing air through conduits or lifting Water, as circumstances require.

The object of the invention is to provide an improved hand pump embodying novel means and simplified structure for obtaining the objectives indicated.

The invention consists in the novel construction, arrangement, and combinations of parts hereinafter more particularly described and claimed.

One sheet of drawings accompanies this specication as part hereof in which like reference characters indicate like parts throughout.

In the drawing:

Figure 1 is a vertical cross section;

Figure 2 is a horizontal cross section taken on line 2-2 of Figure 1;

Figure 3 is a horizontal cross section taken on line 3-3 of Figure 1; and

Figure 4 is a fragmentary vertical cross section showing the piston with the imperforate washers lifted.

Referring to the drawing, my improved hand pump comprises a tubular cylinder I, having an end 2 welded, as at 4, against an inturned end ange 3. Adjacent the other end of cylinder I is provided an outlet port 5.

A closure member 6 is provided for the other end of cylinder I, having an external flange 1 and a centrally located cup-like flange 8 extended into a tubular guide flange 9 adapted to receive and guide the piston rod assembly. The cap 6 is secured to cylinder I, as by screws II. A cap plate I2 is provided to seat on top of closure member 6 and be secured thereto, as by screws I3, thus providing a closure for packing I9 secured in the cup-part 8.

A piston rod herein illustrated as a tubular member I1 is provided, having on its upper and outer end a handle I8 associated with a hub I9 which is provided with a socket 29 in which the tubular piston rod I1 seats and is secured, as by pin 2|. The lower end of hub I9 is externally threaded, as at 22, to receive an interiorly threaded cup-like member 23 having an inwardly directed flange 24 adapted to engage the upper end of a slidable tubular member I4 which extends over piston rod I1.

To the other end of piston rod l1 is secured a stud member 25 which extends into piston rod I1 and is secured thereto, as by pin 26. On stud 25 are secured washers 28, 29, 39 and 32 by means of screw 3|. Of these washers 28, 39 and 32 are rigid and 29 is flexible and cupped. All the washers, 28, 29 and 39, are provided with aligned passages 33. Slidable on piston rod I1 above washer 26 are the imperforate Washers I 6 and 21, of which I6 is rigid and 21 a soft or rubber washer. The slidable tubular member I4 is adapted to engage the rigid washer I6 and to be forced against same by means of threaded cup 23 when the latter is screwed on hub I9.

In the end plate 2 are .provided two valve passages, in one of which is positioned valve 34, which is provided with an outwardly directed ange 35 adapted to be welded or brazed to the outer face of end plate 2. This valve part 34 is exteriorly threaded, as at 36, to provide a coupling nipple while its inner edge is beveled, as at 31, to provide a valve seat against which the valve plate 38 is adapted to be pressed by the flat spring 49 secured thereon, as by button 39. The spring 49 is provided with a U-shaped bend 4I adapted to be Secured by pin 42 extending between wings 43 integral with valve member 59. The tension of spring 49 is reinforced by a wire spring 45.

The valve member 59 is provided with an exteriorly threaded stud adapted to comate with the interiorly threaded socket of valve part 44,

. each of these members being provided with complementary valve chambers so that when screwed together, they mutually lock each other on end plate 2 and secure a screen partition 52 in the valve chamber, above which is positioned the ball valve 69. The valve part 44 is further provided with an exteriorly threaded nipple 46 for which is provided a threaded cap 41 which is secured to the valve, as by chain 48 and screw 49.

In operation, it will be apparent that my improved pump can be utilized in various exigencies,'either as a pressure pump, in which case the tubular slide I4 is screwed down upon piston rod I1 to force imperforate washers I6 and 21 into close engagement with the perforate washers 28, 29, and 39 to provide an imperforate piston. Air will then be admitted to the lower end of the cylinder through valve 34 on the upstroke of the piston, and forced out through valve 44 on the downstroke of the piston.

Alternately when desired, imperforate washers I 6 and 21 may be freed by screwing up cap 23 on hub I9, thus permitting imperforate washers I6 and 21 to separate from perforate Washers 28, 29, and 39, as is illustrated in Figure 4, and by placing cap 41 on valve 44 the device can be used CII as an ordinary liquid lift pump, the water or other uid entering through valve 34 on the upstroke, and passing through orifices 33 on the downward stroke and then being lifted on the next upstroke and discharged through port 5.

Various modifications will readily suggest themselves to those skilled in the art, but within the scope of the present invention, as claimed.

Having fully described my invention, what I claim is:

1. In a pump having a cylinder and a piston rod, a. perforate piston secured on the rod. an imperforate washer slldably mounted on the rod above the perforate piston, a tubular member slidable on the rod adapted to engage the imperforate washer, said tubular member extending with the rod outside of the cylinderv and' means for forcibly sliding the tubular member on. the

rod to force the imperforate Washer into sealing engagement with the perforate piston.

2. In a pump having a cylinder and a piston rod, a cup Washer interposed between rigid disk Washers secured to the end o the rod, all of said washers provided with aligned perforations, a compression washer slidable on the rod above said xed perforate washer and adapted to cover said perforations, a rigid follower washer slidable on the rod above the compression washer, a tubular member slidable on the rod and adapted to engage the rigid follower washer, said tubular member extending with the rod outside of the cylinder, and threaded nut means on the rod outside of the cylinder engaging the outer end of the tubular member.

SEYMOUR J. BAUM. 

